Capsule and a system for preparing a potable beverage from such a capsule

ABSTRACT

Capsule containing a substance for the preparation of a potable beverage. The capsule comprises an aluminum capsule body having a side wall and an outwardly extending flange and a sealing member for providing a fluid sealing contact with an enclosing member of a beverage preparation device. The beverage preparation device comprises an annular element having a free contact end which is provided with a plurality of radially extending open grooves. The sealing member comprises a separate crushable element made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/NL2017/050301, filed May 15, 2017, which claims priority to Netherlands Patent Application No. NL 2016779, filed May 13, 2016, the entire contents of both of which are hereby incorporated herein by reference

BACKGROUND

The invention relates to a capsule containing a substance for the preparation of a potable beverage by extracting and/or dissolving the substance by means of supplying a fluid under pressure into the capsule, wherein the capsule comprises an aluminum capsule body having a central capsule body axis and a total height, said aluminum capsule body being provided with a bottom, a side wall and an outwardly extending flange, the capsule further comprising an aluminum cover attached to the outwardly extending flange, the cover having a cover wall thickness and hermetically closing the capsule, wherein the capsule further comprises a sealing member for providing a fluid sealing contact with an enclosing member of a beverage preparation device if the closed capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of a closing member of the beverage preparation device, such as an extraction plate of the beverage preparation device, such that the outwardly extending flange of the closed capsule and at least a portion of the sealing member of the closed capsule provide a sealing between the enclosing member and the closing member of the beverage preparation device, wherein the enclosing member of the beverage preparation device comprises an annular element having a central annular element axis and a free contact end, said free contact end of the annular element optionally being provided with a plurality of radially extending open grooves.

A capsule containing a substance for the preparation of a potable beverage by extracting and/or dissolving the substance supplying a fluid under pressure into the capsule is known from EP-B-1 700 548. In the known system the capsule is provided with a sealing member having the shape of a step, i.e., a sudden increase of the diameter of the side wall of the capsule, and the enclosing member of this known system has a sealing surface acting on the sealing member to provide deflection of the sealing member, the sealing surface being inclined so that the deflection of the sealing member is an inwards and downwards deformation of the step. Furthermore in the known system the enclosing member comprises a capsule holder and a manually operated or an automatic mechanism for relative displacement of the enclosing member and the capsule holder. The manually operated or an automatic mechanism applies a force on the sealing member of the capsule when the enclosing member closes on the capsule holder. This force should ensure the fluid tight seal between the enclosing member and the capsule. Because the manually operated or an automatic mechanism is arranged to be moved relative to the base, the sealing capabilities of the system can depend on the pressure of the fluid supplied by the fluid supply means. If the pressure of the fluid increases, the force between the sealing member of the capsule and the free end of the enclosing member increases too and thereby the force between the sealing member of the capsule and the free end of the enclosing member increases also. Such a system is described further on. The sealing member of the capsule must be arranged such that upon reaching the maximum fluid pressure in the enclosing member the sealing member should still provide a fluid sealing contact between the enclosing member and the capsule. However, the sealing member must also be arranged such that prior to, or at the start of, brewing when the pressure of the fluid in the enclosing member outside the capsule is relatively low, the sealing member also provides a fluid sealing contact between the enclosing member and the capsule. If at the start of brewing, there would not exist a fluid sealing contact between the capsule and the enclosing member, leakage will occur. However, if leakage occurs there is a real chance that the pressure in the enclosing member and outside the capsule will not sufficiently increase for increasing the force on the sealing member by means of the free end of the enclosing member if the manually operated or an automatic mechanism moves the enclosing member towards the capsule holder. Only if there is a sufficient initial sealing, the pressure in the enclosing member will increase whereby also the force of the free end of the enclosing member acting on the sealing member of the capsule will increase for providing a sufficient fluid sealing contact at also the increased fluid pressure. Moreover, this increased fluid pressure outside the capsule also provides an increased fluid pressure inside the capsule which is essential if the capsule is provided with a cover which is arranged to tear open on relief members of the capsule holder (also called an extraction plate) of the beverage preparation device under the influence of fluid pressure in the capsule.

It follows from the above that the sealing member is a member which is very critical in design. It should be able to provide a fluid sealing contact between the enclosing member and the capsule at a relatively low fluid pressure if only a relatively small force is applied on the sealing member by means of the free end of the enclosing member but it should also provide a fluid sealing contact at a much higher fluid pressure in the enclosing member outside the capsule if a higher force is applied by means of the free end of the enclosing member to the sealing member of the capsule. In particular, when the free contact end of the enclosing member is provided with radially extending open grooves which act as air inlet passage once the force between the enclosing member and the capsule holder is released so that it is easier for a user to take out the capsule, the sealing member must also be able to ‘close’ the radially extending open grooves to provide an effective seal.

SUMMARY

It is an object of the invention to provide an alternative capsule with an alternative sealing member which is relatively easy to manufacture, which is environmentally friendly if the capsule is disposed of after use and/or which provides a satisfactory sealing both at a relatively low fluid pressure if only a relatively small force is applied on the sealing member by means of the free end of the enclosing member (sometimes also called initial seal) and at a much higher fluid pressure if a higher force is applied (e.g. during brewing) by means of the free end of the enclosing member to the sealing member of the capsule, even in case of an enclosing member of which the free contact end is provided with radially extending open grooves.

In accordance with the invention there is provided in a first aspect a capsule containing a substance for the preparation of a potable beverage by extracting and/or dissolving the substance by means of supplying a fluid under pressure into the capsule, wherein the capsule comprises an aluminum capsule body having a central capsule body axis and a total height, said aluminum capsule body being provided with a bottom, a side wall and an outwardly extending flange, the capsule further comprising an aluminum cover attached to the outwardly extending flange, the cover having a cover wall thickness and hermetically closing the capsule, wherein the capsule further comprises a sealing member for providing a fluid sealing contact with an enclosing member of a beverage preparation device if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of a closing member of the beverage preparation device, such as an extraction plate of the beverage preparation device, such that the outwardly extending flange of the capsule and at least a portion of the sealing member of the capsule provide a sealing between the enclosing member and the closing member of the beverage preparation device, wherein the enclosing member of the beverage preparation device comprises an annular element having a central annular element axis and a free contact end, said free contact end of the annular element optionally being provided with a plurality of radially extending open grooves, characterized in that, the sealing member comprises a separate crushable element made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover. Since the sealing member comprises a separate crushable element made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover the capsule as well as the separate crushable element are relatively easy to manufacture. Furthermore by means of the separate crushable element a satisfactory sealing with the enclosing member and the closing member, in particular an enclosing member having a free contact end provided with radially extending open grooves, can be provided. In addition, the separate crushable element can facilitate positioning of the capsule inside the beverage preparation device.

In this application the existence of a fluid sealing contact means that 0-6%, preferably 0-4%, more preferably 0-2.5% of the total fluid supplied to the enclosing member for preparing the beverage may leak away due to leakage between the free contact end and the capsule.

The invention is in particular advantageous when in an embodiment of a capsule the capsule contains an extractable product as substance for the preparation of a potable beverage, said extractable product preferably being 5-20 grams, preferably 5-10 grams, more preferably 5-7 grams of roasted and ground coffee.

In an embodiment of a capsule according to the invention which is in particular easy to manufacture the outer diameter of the outwardly extending flange of the capsule is larger than the diameter of the bottom of the capsule. Preferably, the outer diameter of the outwardly extending flange is approximately 37.1 mm and the diameter of the bottom of the capsule is about 23.3 mm.

The invention is in particular advantageous when in an embodiment of a capsule the thickness of the aluminum capsule body is such that it is deformed easily if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of a closing member of the beverage preparation device, preferably the thickness of the aluminum capsule body is 20 to 200 micrometer, preferably 100 micrometer.

The invention is in particular advantageous when in an embodiment of a capsule the cover wall thickness of the aluminum cover is 15 to 65 micrometer, preferably 30 to 45 micrometer and most preferred 39 micrometer.

In an embodiment of a capsule according to the invention the wall thickness of the aluminum cover is smaller than the wall thickness of the aluminum capsule body.

In a further embodiment of a capsule according to the invention the aluminum cover is arranged to tear open on a closing member of the beverage preparation device, such as an extraction plate of the beverage preparation device under the influence of fluid pressure in the capsule.

In an embodiment of a capsule according to the invention which is in particular easy to manufacture the side wall of the aluminum capsule body has a free end opposite the bottom, the outwardly extending flange extending from said free end of the side wall in a direction at least substantially transverse to the central capsule body axis. Preferably, the outwardly extending flange comprises a curled outer edge, which is beneficial in obtaining for a satisfactory sealing with the free contact end provided with radially extending open grooves.

The radius about the central capsule body axis of an inner edge of the curled outer edge of the outwardly extending flange is preferably at least 32 mm, so that clearance from the annular end surface of the enclosure member is ensured. It is then preferred that the sealing member is positioned between the free end of the side wall of the aluminum capsule body and an inner edge of the curled outer edge of the outwardly extending flange to obtain a still further satisfactory sealing.

To ensure that the curled outer edge does not interfere with operation of a wide variety of commercially available and future beverage preparation apparatuses, the curled outer edge of the outwardly extending flange has a largest dimension of about 1.2 millimeter.

The invention is in particular beneficial for capsules of which the inner diameter of the free end of the side wall of the aluminum capsule body is about 29.5 mm. The distance between the free end of the side wall of the aluminum capsule body and an outermost edge of the outwardly extending flange can be about 3.8 millimeter. The preferred height of the aluminum capsule body is about 28.4 mm.

In an embodiment of a capsule according to the invention which after use is easier for a user to take out of a beverage preparation device the aluminum capsule body is truncated, wherein preferably the side wall of the aluminum capsule body encloses an angle with a line transverse to the central capsule body axis of about 97.5°.

In an advantageous embodiment of a capsule according to the invention the bottom of the aluminum capsule body has a largest inner diameter of about 23.3 mm. It is preferred that the bottom of the aluminum capsule body is truncated, preferably having a bottom height of about 4.0 mm and that the bottom further has a generally flat central portion opposite the cover having a diameter of about 8.3 mm.

In a preferred embodiment of a capsule according to the invention the capsule comprises an inner surface, and wherein on the inner surface of at least the side wall of the capsule an inner coating is provided. In particular when the capsule is manufactured by deep drawing the inner coating facilitates the deep drawing process. In case the aluminum cover of the capsule is attached to the outwardly extending flange by means of a sealing lacquer it is then in particular advantageous when said inner coating is composed of the same material as the sealing lacquer.

In a further embodiment of a capsule according to the invention the capsule comprises an outer surface, wherein on the outer surface of the capsule a color lacquer is provided. In order to facilitate in deep drawing it is preferred to provide on an outer surface of the color.

In an embodiment of a capsule according to the invention which is easy to manufacture the outwardly extending flange is flat and extends transversely to the central capsule body axis.

In a further embodiment of a capsule according to the invention the separate crushable element is made of aluminum having an effective density of about 10% Al. Aluminum with such a density, herein also called soft aluminum, can provide a proper sealing in particular when the enclosing member is provided with radially extending open grooves.

In a still further embodiment of a capsule according to the invention the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, a thickness of 1 mm and a mass of about 0.07 grams, said ring surrounding the side wall. It then can be advantageous when on a surface of the ring opposite the outwardly extending flange the ring is covered with an Al-foil and/or when between the ring and the outwardly extending flange an Al-foil is arranged and/or when on a surface of the ring between the ring and the side wall an Al-foil is arranged and/or when on a surface of the ring opposite the side wall the ring is covered with an Al-foil.

In a further advantageous embodiment of a capsule according to the invention the ring is provided with a sleeve extending towards the bottom of the capsule, said ring being provided at the inner diameter thereof. By means of the sleeve the seal between capsule and enclosing member in particular when the enclosing member is provided with radially extending open grooves can be improved.

In an alternative embodiment of a capsule according to the invention the separate crushable element comprises a plurality of Al-foils randomly applied in layers on a surface of the outwardly extending flange opposite the cover. In a further embodiment of a capsule according to the invention the Al-foils are compressed before application on the surface of the outwardly extending flange. Additionally, or alternatively, the separate crushable element comprises a plurality of Al-foils randomly applied in layers on the side wall of the capsule. In the latter case it is preferred when the plurality of Al-foils cover at least 40% of the total height of the capsule body, preferably the plurality of Al-foils cover 50% of the total height of the capsule body.

In a further alternative embodiment of a capsule according to the invention the separate crushable element comprises a two Al-foils compressed to a washer, said washer being arranged on a surface of the outwardly extending flange opposite the cover. In a further embodiment of a capsule according to the invention the washer has an inner diameter and is provided with a sleeve extending towards the bottom of the capsule, said sleeve being provided at the inner diameter. By means of the sleeve the seal between capsule and enclosing member in particular when the enclosing member is provided with radially extending open grooves can be improved. The previously mentioned embodiments provide a good sealing in particular when the Al-foil has a thickness of 0.3 μm.

In a further alternative embodiment of a capsule according to the invention the separate crushable element comprises a folded Al-foil having a thickness of 10 μm tightly wrapped around the side wall, said folded Al-foil extending from the outwardly extending flange over at least 40% of the total height of the capsule body, preferably over about 50% of the total height of the capsule body.

In a still further alternative embodiment of a capsule according to the invention the separate crushable element comprises a nine folded Al-foil having a thickness of 10 μm loosely wrapped around the side wall, said folded Al-foil extending from the outwardly extending flange over at least 40% of the total height of the capsule body, preferably over about 50% of the total height of the capsule body.

In a yet further alternative embodiment of a capsule according to the invention the separate crushable element comprises a twelve folded Al-foil having a thickness of 10 μm wrapped around the side wall, said folded Al-foil extending from the outwardly extending flange over about 20 to 40% of the total height of the capsule body, preferably over about 25% of the total height of the capsule body.

In a still further alternative embodiment of a capsule according to the invention the separate crushable element comprises a vertically corrugated two ply Al-foil having a thickness of 10 μm arranged around the side wall, said folded Al-foil extending from the outwardly extending flange over about 20 to 40% of the total height of the capsule body, preferably over about 25% of the total height of the capsule body. It can then be advantageous when the vertically corrugated two ply Al-foil is provided with an Al-collar having a thickness of 10 μm on at least one of the following: a side of the vertically corrugated Al-foil opposite the outwardly extending flange, a side of vertically corrugated Al-foil opposite the side wall, a side of vertically corrugated Al-foil between the outwardly extending flange and the vertically corrugated Al-foil and a side of vertically corrugated Al-foil between the side wall and the vertically corrugated Al-foil, said vertically corrugated Al-foil extending from the outwardly extending flange over about 20 to 40% of the total height of the capsule body, preferably over about 25% of the total height of the capsule body.

In yet a further alternative embodiment of a capsule according to the invention the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, said ring being die cut from 32 layers of 10 μm Al-foil pressed together to a single washer.

In an even further alternative embodiment of a capsule according to the invention the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, said ring being formed of eight Al-layers each having the same thickness as the cover, each Al-layer being separately die cut and stacked on each other on the outwardly extending flange. Alternatively, the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, said ring being formed of seven Al-layers each having the same thickness as the cover, said seven Al-layers being stacked and thereafter die cut and arranged on the outwardly extending flange.

In an embodiment of a capsule according to the invention, wherein the aluminum is grade 1000 series Al, the sealing member is relatively easy to manufacture, which is environmentally friendly if the capsule is disposed of after use. Please note that in alternative embodiments also aluminum alloys can be used.

The above mentioned alternative embodiments appear to provide a satisfactory seal during use of the capsule.

In accordance with an embodiment of a capsule according to the invention a satisfactory sealing both at a relatively low fluid pressure and at a much higher fluid pressure, even in case of an enclosing member which is provided with radially extending open grooves, can be obtained when the sealing member is loose from the side wall and the outwardly extending flange. Thus there is no need to attach or seal or otherwise attach the sealing member to the capsule.

In particular when the outwardly extending flange is flat and extends transversely to the central capsule body axis, the separate crushable element provides a satisfactory seal during use of the capsule.

In a still further embodiment of a capsule according to the invention the separate crushable element is positioned such that the free contact end of the annular element comes into contact with the separate crushable element.

In the light of this invention with crushable element is meant an element which is deformable if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of a closing member of the beverage preparation device. Further, in the light of this invention with separate crushable element is meant a crushable element which is not integrally formed together with the aluminum capsule body but is formed as a separate component.

In accordance with the invention there is provided in a second aspect a system for preparing a potable beverage from a capsule using a fluid supplied under pressure into the capsule, comprising:

-   -   a capsule according to the invention;     -   a beverage preparation device comprising an enclosing member for         receiving the capsule, wherein the enclosing member comprises         fluid supply means for supplying fluid under pressure into the         capsule, wherein the beverage preparation device further         comprises a closing member, such as an extraction plate, for         closing the enclosing member of the beverage preparation device,         wherein the enclosing member of the beverage preparation device         further comprises an annular element having a central annular         element axis and a free contact end, said free contact end of         the annular element optionally being provided with a plurality         of radially extending open grooves;     -   the sealing member of the capsule being arranged for providing a         fluid sealing contact with the enclosing member of the beverage         preparation device if the capsule is positioned in the enclosing         member of the beverage preparation device and the enclosing         member is closed by means of the closing member of the beverage         preparation device, such that the outwardly extending flange of         the capsule and at least a portion of the sealing member of the         capsule provide a sealing between the enclosing member and the         closing member of the beverage preparation device.

Since the sealing member comprises a separate crushable element made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover, the capsule as well as the separate crushable element are relatively easy to manufacture. Furthermore by means of the separate crushable element a satisfactory sealing with the enclosing member provided with radially extending open grooves can be provided.

Regarding the preferred embodiments of the system as mentioned in the dependent claims which relate to the same features as the features of the dependent claims of the capsule reference is made to the above.

The invention is particularly suitable in a system according to the invention wherein, in use, the maximum fluid pressure in the enclosing member of the beverage preparation device is in the range of 6-20 bar, preferably between 12 and 18 bar. Even at these high pressures a satisfactory seal between capsule and beverage preparation device can be obtained.

Preferably the system is arranged such that, in use, during brewing, a free end of the enclosing member of the beverage preparation device exerts a force F2 on the outwardly extending flange (and—if present—the sealing member arranged thereon) of the capsule arranged on the outwardly extending flange of the capsule to provide a fluid sealing contact between the outwardly extending flange of the capsule and the enclosing member of the beverage preparation device, wherein F2 is in the range of 500-1500 N preferably in the range of 750-1250 N when the fluid pressure P2 in the enclosing member of the beverage preparation device outside the capsule is in the range of 6-20 bar, preferably between 12 and 18 bar. In particular the system is arranged such that, in use, prior to or at the start of brewing, a free end of the enclosing member of the beverage preparation device exerts a force F1 on the sealing member of the capsule arranged on the outwardly extending flange of the capsule to provide a fluid sealing contact between the outwardly extending flange of the capsule and the enclosing member of the beverage preparation device, wherein F1 is in the range of 30-150 N preferably in the range of 40-150 N, more preferably 50-100 N, when the fluid pressure P1 in the enclosing member of the beverage preparation device outside the capsule is in the range of 0.1-4 bar, preferably between 0.1-1 bar.

In an embodiment of a system according to the invention wherein the plurality of radially extending open grooves are uniformly spaced relative to each other in tangential direction of the free contact end of the annular element of the beverage preparation device so that it is easier for a user to take out the capsule while a satisfactory seal between capsule and beverage preparation device can still be provided.

In an advantageous embodiment of a system according to the invention the longest tangential width of each groove (top to top, i.e. equal to the groove to groove pitch) is 0.9-1.1 mm, preferably 0.95 to 1.05 mm, more preferably 0.98 to 1.02 mm, wherein a maximal height of each groove in an axial direction of the enclosing member of the beverage preparation device is 0.01-0.09 mm, preferably 0.03 to 0.07 mm, more preferably 0.045 to 0.055 mm, most preferred 0.05 mm and wherein the number of grooves is 90 to 110, preferably 96. The radial width of the annular end surface at the location of the grooves may for instance be 0.05-0.9 mm, preferably 0.2-0.7 mm and more preferably 0.3-0.55 mm.

The invention is in particular suitable when applied to an embodiment of system according to the invention in which during use when the closing member of the beverage preparation device closes the enclosing member of the beverage preparation device, at least the free contact end of the enclosing member of the beverage preparation device can move relative to the closing member of the beverage preparation device under the effect of the pressure of the fluid in the enclosing member of the beverage preparation device towards the closing member of the beverage preparation device for applying the maximum force between the flange of the capsule and the free end of the enclosing member of the beverage preparation device. The enclosing member may comprise a first part and a second part wherein the second part comprises the free contact end of the enclosing member wherein the second part can move relative to the first part between a first and second position. The second part can move from the first position towards the second position in the direction of the closing member under the influence of fluid pressure in the enclosing member. The force F1 as discussed above may be reached if the second part is in the first position with a fluid pressure P1. The force F2 as discussed above may be reached if the second part is moved towards the second position under the influence of the fluid pressure P2 in the enclosing member.

In an embodiment of a system according to the invention the fluid supply means are arranged for supplying a flow of fluid in the range of 0.5-2 ml/s, wherein the fluid sealing contact provided by the sealing member provides a leakage percentage of less then 4%, preferably less than 2.5% of said flow. The sealing member provides a satisfactory seal when the leakage percentage is within these ranges.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be further elucidated by means of, non-limiting, examples referring to the drawing, in which:

FIG. 1 shows a schematic representation of an embodiment of a system according to the invention;

FIG. 2 in a perspective view shows an embodiment of a beverage preparation device of a system according to the invention showing the free contact end of the enclosing member of the beverage preparation device with the plurality of radially extending open grooves;

FIG. 3A in cross section shows an embodiment of a capsule according to the invention before use;

FIG. 3B shows an enlarged detail of the capsule of FIG. 3A showing the outwardly extending flange and the sealing member;

FIG. 3C shows an enlarged detail of the outwardly extending flange of the capsule in FIGS. 3A and 3B after use;

FIG. 4A in perspective shows a first embodiment of a capsule according to the invention with a separate annular crushable element made of aluminum as sealing member stacked on the outwardly extending flange of the capsule;

FIG. 4B in perspective shows the separate annular crushable element made of aluminum of FIG. 4A;

FIG. 4C in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A;

FIG. 4D in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A in an embodiment having an Al-foil arranged on a surface of the annular crushable element opposite the outwardly extending flange;

FIG. 4E in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A in an embodiment having an Al-foil arranged between the annular crushable element and the outwardly extending flange;

FIG. 4F in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A in an embodiment having an Al-foil arranged on a surface of the annular crushable element opposite the side wall, between the annular crushable element and the side wall, and between the annular crushable element and the outwardly extending flange;

FIG. 4G in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A in an embodiment having a single Al-foil arranged on and wrapped around all sides of the annular crushable element;

FIG. 4H in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A in an embodiment having an Al-foil arranged on a surface of the annular crushable element opposite the outwardly extending flange and having another Al-foil arranged on a surface of the annular crushable element opposite the side wall, between the annular crushable element and the side wall, and between the annular crushable element and the outwardly extending flange;

FIG. 4I in cross-section shows the separate annular crushable element made of aluminum of FIG. 4A in an embodiment having an Al-foil arranged on a surface of the annular crushable element opposite the outwardly extending flange and on a surface of the annular crushable element opposite the side wall;

FIG. 5A in perspective shows a further embodiment of capsule according to the invention in which the sealing member comprises a plurality of Al-foils randomly applied in layers on a surface of the outwardly extending flange opposite the cover and on the side wall of the capsule;

FIG. 5B in perspective shows another embodiment of capsule according to the invention in which the sealing member comprises a plurality of Al-foils randomly applied in layers only on a surface of the outwardly extending flange opposite the cover;

FIG. 5C in perspective shows a still further embodiment of a capsule according to the invention in which the sealing member comprises a plurality of Al-foils randomly applied in layers only on the side wall of the capsule;

FIG. 5D in perspective shows a further embodiment of a capsule according to the invention in which the separate crushable element comprises a vertically corrugated two ply Al-foil having a thickness of 10 μm arranged around the side wall which is provided with an Al-collar between the side wall and the vertically corrugated Al-foil;

FIG. 5E in perspective shows a still further embodiment of a capsule according to the invention in which the separate crushable element comprises a vertically corrugated two ply Al-foil which is provided with an Al-collar on a side of the vertically corrugated Al-foil opposite the outwardly extending flange and with an Al-collar on a side of vertically corrugated Al-foil between the outwardly extending flange and the vertically corrugated Al-foil; and

FIG. 5F in perspective shows a fourth embodiment of a capsule according to the invention in which the separate crushable element comprises a vertically corrugated two ply Al-foil which is provided with an Al-collar on a side of vertically corrugated Al-foil opposite the side wall and with an Al-collar on a side of vertically corrugated Al-foil between the side wall and the vertically corrugated Al-foil.

DETAILED DESCRIPTION

In the Figures and the following description, like reference numerals refer to like features.

FIG. 1 shows a schematic representation, in cross sectional view, of an embodiment of a system 1 for preparing a potable beverage from a capsule using a fluid supplied under pressure into the capsule. The system 1 comprises a capsule 2, and a beverage preparation device 4. The device 4 comprises enclosing member 6 for holding the capsule 2. The device 4 further comprises a closing member, such as an extraction plate, 8 for supporting the capsule 2.

In FIG. 1 a gap is drawn between the capsule 2, the enclosing member 6 and the extraction plate 8 for clarity. It will be appreciated that, in use, the capsule 2 may lie in contact with the enclosing member 6 and the extraction plate member 8. Commonly, the enclosing member 6 has a shape complementary to the shape of the capsule 2. The device 4 further comprises a fluid supply means 10 for supplying an amount of a fluid, such as water, under a pressure in the range of 6-20 bar, preferably between 12 and 18 bar, to the exchangeable capsule 2.

In the example shown in FIG. 1, the exchangeable capsule 2 comprises an aluminum capsule body 12 having a central capsule body axis 12A and an aluminum cover 14 with a cover wall thickness. In the present context, the meaning of ‘aluminum’ is understood to also include aluminum alloy, but preferably grade 1000 series Al is used. In this example, the aluminum capsule body 12 comprises a side wall 16, a bottom 18 closing the side wall 16 at a first end, and an outwardly extending flange 20 extending outwardly of the circumferential wall 16 at a second end opposite the bottom 18. The side wall 16, the bottom 18 and the cover 14 enclose an inner space 22 comprising a substance for the preparation of a potable beverage by extracting and/or dissolving the substance. Preferably the substance is an extractable substance, preferably 5-20 grams, preferably 5-10 grams, more preferably 5-7 grams of roasted and ground coffee for the preparation of a single beverage. The capsule is initially sealed, i.e. is hermetically closed prior to use.

The system 1 of FIG. 1 comprises bottom piercing means 24 for piercing the bottom 18 of the capsule 2 for creating at least one entrance opening 25 in the bottom 18 for supplying the fluid to the extractable product through the entrance opening 25.

The system 1 of FIG. 1 further comprises cover piercing means 26, here embodied as protrusions of the closing member 8, for piercing the cover 14 of the capsule 2. The cover piercing means 26 may be arranged to tear the cover 14 once a (fluid) pressure inside the inner space 22 exceeds a threshold pressure and presses the cover 14 against the cover piercing means 26 with sufficient force. The aluminum cover 14 thus is arranged to tear open on the closing member 8 of the beverage preparation device under the influence of fluid pressure in the capsule.

The capsule 2 further comprises a sealing member 28, in FIGS. 1, 3A and 3B indicated as a general box but more detailed described with regard to FIGS. 4 and 5, which sealing member 28 comprises a separate crushable element made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange 20—opposite the cover 14 for providing a fluid sealing contact with the enclosing member 6 if the capsule 2 is positioned in the enclosing member 6 and the enclosing member 6 is closed by means of the extraction plate 8, such that the outwardly extending flange 20 of the capsule 2 and at least a portion of the sealing member 28 are sealingly engaged between the enclosing member 6 and the extraction plate 8.

As shown in FIG. 2 the enclosing member 6 of the beverage preparation device comprises an annular element 41 having a central annular element axis 41A and a free contact end 30. The free contact end 30 of the annular element 41 is provided with a plurality of radially extending open grooves 40. The plurality of radially extending open grooves 40 are uniformly spaced relative to each other in tangential direction of the free contact end 30 of the annular element 41. The longest tangential width of each groove 40 is 0.9-1.1 mm, preferably 0.95 to 1.05 mm, more preferably 0.98 to 1.02 mm, wherein a maximal height of each groove 40 in an axial direction of the enclosing member 6 is 0.01-0.09 mm, preferably 0.03 to 0.07 mm, more preferably 0.045 to 0.055 mm, and most preferred 0.05 mm. The number of grooves 40 lies in the range of 90 to 110, preferably 96. Usually, the radial width of the free end at the location of the grooves is 0.05-0.9 mm, more specifically 0.2-0.7 mm, more specifically 0.3-0.55 mm.

An embodiment of a capsule according to the invention is shown more detailed in FIGS. 3A and 3B. In the shown embodiment the outer diameter ODF of the outwardly extending flange 20 is larger than the diameter DB of the bottom 18 of the capsule 2. In the shown embodiment the outer diameter ODF of the outwardly extending flange 20 is approximately 37.1 mm and the diameter DB of the bottom 18 is about 23.3 mm. The thickness of the aluminum capsule body 12 is such that it is deformed easily if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of a closing member of the beverage preparation device, preferably the thickness of the aluminum capsule body is 100 micrometer, but in other embodiments the thickness can be 20 to 200 micrometer.

In the shown embodiment, the wall thickness of the aluminum cover 14 is 39 micrometer. The wall thickness of the aluminum cover 14 is preferably smaller than the thickness of the aluminum capsule body 12.

The side wall 16 of the aluminum capsule body 12 has a free end 42 opposite the bottom 18. The inner diameter IDF of the free end 42 of the side wall 16 of the aluminum capsule body 12 is about 29.5 mm. The outwardly extending flange 20 extends from that free end 42 in a direction at least substantially transverse to the central capsule body axis 12A. The outwardly extending flange 20 comprises a curled outer edge 43 which is beneficial for obtaining a seal between the capsule and the enclosing member. In the shown embodiment the curled outer edge 43 of the outwardly extending flange 20 has a largest dimension of about 1.2 millimeter. The distance DIF between the free end 42 of the side wall 16 of the aluminum capsule body 12 and an inner edge 43A of the curled outer edge 43 is about 2.7 mm, while the distance DOF between the free end 42 of the side wall 16 of the aluminum capsule body 12 and an outermost edge 43B of the outwardly extending flange 20 is about 3.8 millimeter. The radius about the central capsule body axis of the inner edge 43A of the curled outer edge 43 is preferably at least 32 mm.

As shown in FIGS. 3A and 3B the sealing member 28 is positioned on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover 14 between the inner edge 43A of the curled outer edge 42 of the outwardly extending flange and extends up to the side wall 16. The sealing member 28 is indicated as a general box, but will be described in more detail below, and e.g. can be arranged on the outwardly extending flange only, arranged around the side wall only or a combination of both.

As can be seen from FIG. 3A the aluminum capsule body 12 is truncated. In the embodiment shown, the side wall 16 of the aluminum capsule body 12 encloses an angle A with a line transverse to the central capsule body axis 12A of about 97.5°. The bottom 18 of the aluminum capsule body 12 has a largest inner diameter DB of about 23.3 mm. The bottom 18 of the aluminum capsule body 12 is also truncated, and in the shown embodiment has a bottom height BH of about 4.0 mm. The bottom 18 further has a generally flat central portion 18A opposite the cover 14, which central portion 18A has a diameter DEE of about 8.3 mm and in which central portion 18A the entrance opening(s) 25 may be made. The entrance openings may also be made in the truncated portion between the central portion 18A and the side wall 16. The total height TH of the aluminum capsule body 12 of the capsule is about 28.4 mm.

The system 1 shown in FIG. 1 is operated as follows for preparing a cup of a potable beverage, in the present example coffee, wherein the substance is roasted and ground coffee.

The capsule 2 is placed in the enclosing member 6. The extraction plate 8 is brought into contact with the capsule 2. The bottom piercing means 24 pierce the bottom 18 of the capsule 2 for creating the entrance openings 25. The fluid, here hot water under pressure, is supplied to the extractable product in the inner space 22 through the entrance openings 25. The water will wet the coffee grounds and extract the desired substances to form the coffee beverage.

During supplying the water under pressure to the inner space 22, the pressure inside the capsule 2 will rise. The rise in pressure will cause the cover 14 to deform and be pressed against the cover piercing means 26 of the extraction plate. Once the pressure reaches a certain level, the tear strength of the cover 14 will be surpassed and the cover 14 will rupture against the cover piercing means 26, creating exit openings. The prepared coffee will drain from the capsule 2 through the exit openings and outlets 32 (see FIG. 1) of the extraction plate 8, and may be supplied to a container such as a cup (not shown).

The system 1 is arranged such that prior to or at the start of brewing, the free contact end 30 of the enclosing member 6 exerts a force F1 on the outwardly extending flange 20 (and—if present—the sealing member 28 arranged thereon) of the capsule 2 to provide a fluid sealing contact between the outwardly extending flange 20 of the capsule 2 and the enclosing member 6 of the beverage preparation device, wherein F1 is in the range of 30-150 N preferably 40-150 N, more preferably 50-100 N, when the fluid pressure P1 in the enclosing member of the beverage preparation device outside the capsule is in the range of 0.1-4 bar, preferably 0.1-1 bar. During brewing, the free contact end 30 of the enclosing member 6 exerts a force F2 on the outwardly extending flange 20 of the capsule 2 to provide a fluid sealing contact between the outwardly extending flange 20 of the capsule 2 and the enclosing member 6, wherein the force F2 is in the range of 500-1500 N, preferably in the range of 750-1250 N, when the fluid pressure P2 in the enclosing member 6 of the beverage preparation device outside the capsule 2 is in the range of 6-20 bar, preferably between 12 and 18 bar. In the shown embodiment the free contact end 30 of enclosing member 6 can move relative to the extracting plate 8 under the effect of the pressure of the fluid in the enclosing member 6 device towards the extraction plate 8 for applying the maximum force F2 between the outwardly extending flange 20 and the free end 30 of the enclosing member 6. This movement can take place during use, i.e. in particular at the start of brewing and during brewing. The enclosing member 6 has a first part 6A and a second part 6B wherein the second part comprises the free contact end 30. The second part 6B can move relative to the first part 6A between a first and second position. The second part 6B can move from the first position towards the second position in the direction of the closing member 8 under the influence of fluid pressure in the enclosing member 6. The force F1 as discussed above may be reached if the second part 6B is in the first position with a fluid pressure P1. The force F2 as discussed above may be reached if the second part 6B is moved towards the second position under the influence of the fluid pressure P2 in the enclosing member 6.

As a result of the force applied the sealing member 28 of the capsule according to the invention undergoes a plastic deformation and closely conforms to the grooves 40 of the free contact end 30 and thus provides a fluid sealing contact between the enclosing member 6 and the capsule 3 at a relatively low fluid pressure during start up of brewing but also provides a fluid sealing contact at the much higher fluid pressure in the enclosing member outside the capsule during brewing. This close conformation to the grooves 40 of the enclosing member is indicated in FIG. 3C which shows the capsule 2 of the invention after use, and which clearly indicates that the outwardly extending flange 20 comprises deformations 40′ which conform to the grooves 40 of the enclosing member.

Now exemplary embodiments of a capsule according to the invention having sealing member comprising a separate crushable element 28 made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover will be described in more detail with regard to FIGS. 4 and 5. In the shown embodiments the separate crushable element 28 is made of series 1000 aluminum. In addition in the shown embodiments the outwardly extending flange is flat and extends transversely to the central capsule body axis. It will be clear that in different embodiment the outwardly extending flange can enclose an angle with the normal to the central capsule body axis. Further, in the shown embodiments the separate crushable element is loosely arranged on the capsule body, but if required can in other embodiments be attached to the capsule body, for example by means of welding. Finally, in all the shown embodiments the separate crushable element is positioned such that if the capsule is positioned in the enclosing member of the beverage preparation device the free contact end 30 of the second part 6B and/or the inner surface of the second part 6B is in contact with the separate crushable element 28.

FIG. 4A in perspective shows a first embodiment of a capsule 2 according to the invention with an separate annular crushable element 28 made of aluminum as sealing member stacked on the outwardly extending flange 20 of the capsule 2. In FIG. 4B shows the separate annular crushable element 28 of FIG. 4A is shown in perspective, while FIG. 4C shows the cross-section thereof. The separate crushable element 28 is made of aluminum having an effective density of about 10% Al and thus is formed as an annulus or a ring provided on the surface of the outwardly extending flange 20 opposite the cover. The ring 28 has an outer diameter of 34 mm, an inner diameter of 30 mm, a thickness of 1 mm and a mass of about 0.07 grams, and when places on the capsule 2 the ring 28 surrounds the side wall 16. The separate crushable element 28 can be formed from two Al-foils having a thickness of 0.3 μm which are compressed to the annulus or ring, which can be compared with a washer. The ring 28 can according to the invention alternatively be formed by being die cut from 32 layers of 10 μm Al-foil pressed together to a single washer. The ring 28 can according to the invention alternatively be formed by being formed of eight Al-layers each having the same thickness as the cover (e.g. 39 micrometer), each Al-layer being separately die cut and stacked on each other on the outwardly extending flange 20 to form the annular sealing member 28 or by being formed of seven Al-layers each having the same thickness as the cover, said seven Al-layers being stacked and thereafter die cut and arranged on the outwardly extending flange 20.

In FIG. 4D an embodiment of the separate annular crushable element 28 made of aluminum of FIG. 4A is shown in cross-section further having an Al-foil 50 having a thickness of 0.3 μm arranged on a surface of the annular crushable element 28 opposite the outwardly extending flange 20.

In FIG. 4E an embodiment of the separate annular crushable element 28 made of aluminum of FIG. 4A is shown in cross-section further having an Al-foil 51 having a thickness of 0.3 μm arranged between the annular crushable element 28 and the outwardly extending flange 20.

In FIG. 4F a further embodiment of the separate annular crushable element 28 made of aluminum of FIG. 4A is shown in cross-section further having an Al-foil 52 having a thickness of 0.3 μm arranged on a surface of the annular crushable element 28 opposite the side wall 16, between the annular crushable element 28 and the side wall 16, and between the annular crushable element 28 and the outwardly extending flange 20.

In FIG. 4G a yet further embodiment of the separate annular crushable element 28 made of aluminum of FIG. 4A is shown in cross-section further a single Al-foil 53 having a thickness of 0.3 μm arranged on and wrapped around all sides of the annular crushable element 28.

In FIG. 4H another embodiment of the separate annular crushable element 28 made of aluminum of FIG. 4A is shown in cross-section further having an Al-foil 55 having a thickness of 0.3 μm arranged on a surface of the annular crushable element 28 opposite the outwardly extending flange 20 and having another Al-foil 54 having a thickness of 0.3 μm arranged on a surface of the annular crushable element 28 opposite the side wall 16, between the annular crushable element 28 and the side wall 16 and between the annular crushable element 28 and the outwardly extending flange 20.

In FIG. 4I a yet further embodiment of the separate annular crushable element 28 made of aluminum of FIG. 4A is shown in cross-section further having an Al-foil 56 having a thickness of 0.3 μm arranged on a surface of the annular crushable element 28 opposite the outwardly extending flange 20 and on a surface of the annular crushable element 28 opposite the side wall 16.

FIG. 5A in perspective shows a further embodiment of a capsule 2 according to the invention in which the sealing member 28 comprises a plurality of Al-foils randomly applied in layers on a surface of the outwardly extending flange 20 opposite the cover and on the side wall 16 of the capsule. The plurality of Al-foils cover at least 40% of the total height TH of the capsule body, preferably the plurality of Al-foils cover 50% of the total height TH of the capsule body. Each of the Al-foils has a thickness of 0.3 μm.

In FIG. 5B another embodiment of a capsule 2 according to the invention is shown in perspective in which with regard to the embodiment shown in FIG. 5A the randomly applied plurality of Al-foils is provided in layers only on a surface of the outwardly extending flange 20 opposite the cover.

In FIG. 5C yet another embodiment of a capsule 2 according to the invention is shown in perspective in with regard to the embodiment shown in FIG. 5A the randomly applied plurality of Al-foils is provided in layers only on the side wall 16 of the capsule 2.

In FIG. 5D a further embodiment of a capsule 2 according to the invention is shown in perspective in which the separate crushable element 28 comprises a vertically (i.e. parallel to the central body axis) corrugated two ply Al-foil having a thickness of 10 μm arranged around the side wall 16 which is provided with an Al-collar 60 between the side wall 16 and the vertically corrugated Al-foil. The folded Al-foil extends from the outwardly extending flange 20 over about 20 to 40% of the total height TH of the capsule body, preferably over about 25% of the total height TH of the capsule body.

In FIG. 5E a still further embodiment of a capsule 2 according to the invention is shown in perspective in which the separate crushable element 28 comprises a vertically corrugated two ply Al-foil which is provided with an Al-collar 61 on a side of the vertically corrugated Al-foil opposite the outwardly extending flange 20 and with an Al-collar 62 on a side of vertically corrugated Al-foil between the outwardly extending flange 20 and the vertically corrugated Al-foil.

In FIG. 5F a yet further embodiment of a capsule 2 according to the invention is shown in perspective in which the separate crushable element 28 comprises a vertically corrugated two ply Al-foil which is provided with an Al-collar 63 on a side of vertically corrugated Al-foil opposite the side wall 16 and with an Al-collar 60 on a side of vertically corrugated Al-foil between the side wall 16 and the vertically corrugated Al-foil.

In the foregoing specification, the invention has been described with reference to specific examples of embodiments of the invention. It will, however, be evident that various modifications and changes may be made therein without departing from the broader spirit and scope of the invention as set forth in the appended claims. 

1. A capsule for use with an enclosing member and a closing member of a beverage preparation device, and containing a substance for the preparation of a potable beverage by extracting and/or dissolving the substance by a fluid supplied under pressure into the capsule by the beverage preparation device, the capsule comprising: an aluminum capsule body having a central capsule body axis and a total height (TH), said aluminum capsule body being provided with a bottom, a side wall and an outwardly extending flange, an aluminum cover attached to the outwardly extending flange, the cover having a cover wall thickness and hermetically closing the capsule, a sealing member for providing a fluid sealing contact with the enclosing member of the beverage preparation device if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by the closing member of the beverage preparation device, such that the outwardly extending flange of the capsule and at least a portion of the sealing member of the capsule provide a sealing between the enclosing member and the closing member of the beverage preparation device, wherein the sealing member comprises a separate crushable element made of aluminum provided on the capsule body at a side thereof, which side is—when seen from the outwardly extending flange—opposite the cover.
 2. The capsule according to claim 1, wherein the separate crushable element is made of aluminum having an effective density of about 10% Al.
 3. The capsule according to claim 1, wherein the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, a thickness of 1 mm and a mass of about 0.07 grams, said ring surrounding the side wall.
 4. The capsule according to claim 3, wherein on a surface of the ring opposite the outwardly extending flange the ring is covered with an Al-foil.
 5. The capsule according to claim 3, wherein between the ring and the outwardly extending flange an Al-foil is arranged.
 6. The capsule according to claim 3, wherein on a surface of the ring between the ring and the side wall an Al-foil is arranged.
 7. The capsule according to claim 3, wherein on a surface of the ring opposite the side wall the ring is covered with an Al-foil.
 8. The capsule according to claim 3, wherein the ring extends towards the bottom of the capsule, said ring being provided with a sleeve provided at the inner diameter thereof.
 9. The capsule according to claim 1, wherein the separate crushable element comprises two Al-foils compressed to a washer, said washer being arranged on a surface of the outwardly extending flange opposite the cover.
 10. The capsule according to claim 9, wherein the washer has an inner diameter and is provided with a sleeve extending towards the bottom of the capsule, said sleeve being provided at the inner diameter.
 11. The capsule according to claim 3, wherein the Al-foil has a thickness of 0.3 μm.
 12. The capsule according to claim 1, wherein the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, said ring being die cut from 32 layers of 10 μm Al-foil pressed together to a single washer.
 13. The capsule according to claim 1, wherein the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, said ring being formed of eight Al-layers each having the same thickness as the cover, each Al-layer being separately die cut and stacked on each other on the outwardly extending flange.
 14. The capsule according to claim 1, wherein the separate crushable element is a ring provided on the surface of the outwardly extending flange opposite the cover, said ring having an outer diameter of 34 mm, an inner diameter of 30 mm, said ring being formed of seven Al-layers each having the same thickness as the cover, said seven Al-layers being stacked and thereafter die cut and arranged on the outwardly extending flange.
 15. The capsule according to claim 1, wherein the aluminum is grade 1000 series Al.
 16. The capsule according to claim 1, wherein the sealing member is loose from the side wall and the outwardly extending flange.
 17. The capsule according to claim 1, wherein the outwardly extending flange is flat and extends transversely to the central capsule body axis.
 18. The capsule according to claim 1, wherein the closing member is an extraction plate.
 19. The capsule according to claim 1, wherein the enclosing member of the beverage preparation device comprises an annular element having a central annular element axis and a free contact end, said free contact end of the annular element optionally being provided with a plurality of radially extending open grooves.
 20. The capsule according to claim 19, wherein the free contact end of the annular element comprises a plurality of radially extending open grooves.
 21. A system for preparing a potable beverage from a capsule using a fluid supplied under pressure into the capsule, comprising: a capsule according to claim 1; a beverage preparation device comprising an enclosing member for receiving the capsule, wherein the enclosing member comprises fluid supply means for supplying fluid under pressure into the capsule, wherein the beverage preparation device further comprises a closing member, such as an extraction plate, for closing the enclosing member of the beverage preparation device, wherein the enclosing member of the beverage preparation device further comprises an annular element having a central annular element axis and a free contact end, said free contact end of the annular element optionally being provided with a plurality of radially extending open grooves; the sealing member of the capsule being arranged for providing a fluid sealing contact with the enclosing member of the beverage preparation device if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by the closing member of the beverage preparation device, such that the outwardly extending flange of the capsule and at least a portion of the sealing member of the capsule provide a sealing between the enclosing member and the closing member of the beverage preparation device. 